Mitch, that business about the NC Expedition having a starting "passenger" weight of 190 lbs. has me baffled. I don't weigh that much--even with my clothes on. But I don't carry any passengers along if I can help it.
Saying that a boat has nothing but size (length) to suggest that it might be fast is like saying that a car with a 500 hp engine has little else to suggest that it might be fast. Of course there are many other design factors involved in determining a boats potential velocity. If you ever get a chance to look at the hull design on an NC, you will see why they are fast.
If ultimate top speed were the only criteria for a proper kayak, I guess anyone could design a good one. My preference is for a boat that is fast, comfortable, seaworthy, stable, dry, tracks, and isn't much affected by wind and current. Oh, and is light enough to carry on my shoulder, beautiful in design and workmanship....
There I go again. I just can't help it.
I'm not sure why you are "baffled", I'm just suggesting that a boat designed for someone a bit heavier than me is not going to be the fastest design for me PERHAPS. "The NC19 best fits paddlers measuring 5'6"- 6'8" weighing between 190-350 lbs. with up to a size 15½ shoe." -novuscomposites.com.
I also go on to state that the NC19 is a great boat because of it's usability. I also notice that they offer a TON of colors which is fairly rare..